Top: occurrence of observations vs. CML and ΦIo over the time interval 1990–2015. The number of minutes of observations is coded in gray levels in each 5° × 5° bin. Every bin was observed for ≥505 min (or 0.015% of the total duration of observations). The highest bins correspond to 798 min (0.024%) of observation and correspond to the region where we expected enhanced Io emission, which motivated a higher priority of observation. Integration of this plot vs. each dimension results in the number of minutes of observation vs. CML (top) and ΦIo (right). The inhomogeneity of the coverage is <10% in both coordinates.
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